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/*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
* Other licenses:
* -----------------------------------------------------------------------------
* Commercial licenses for this work are available. These replace the above
* ASL 2.0 and offer limited warranties, support, maintenance, and commercial
* database integrations.
*
* For more information, please visit: http://www.jooq.org/licenses
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package org.jooq.impl;
import static java.util.Arrays.asList;
import static org.jooq.Comparator.IS_DISTINCT_FROM;
import static org.jooq.Comparator.IS_NOT_DISTINCT_FROM;
// ...
// ...
import static org.jooq.SQLDialect.CUBRID;
// ...
import static org.jooq.SQLDialect.DERBY;
// ...
// ...
// ...
import static org.jooq.SQLDialect.MARIADB;
import static org.jooq.SQLDialect.MYSQL;
// ...
// ...
import static org.jooq.SQLDialect.SQLITE;
// ...
// ...
// ...
import static org.jooq.impl.DSL.condition;
import static org.jooq.impl.DSL.decode;
import static org.jooq.impl.DSL.exists;
import static org.jooq.impl.DSL.notExists;
import static org.jooq.impl.DSL.one;
import static org.jooq.impl.DSL.select;
import static org.jooq.impl.DSL.zero;
import org.jooq.Clause;
import org.jooq.Comparator;
import org.jooq.Configuration;
import org.jooq.Context;
import org.jooq.Field;
import org.jooq.QueryPartInternal;
import org.jooq.SQLDialect;
/**
* @author Lukas Eder
*/
final class IsDistinctFrom extends AbstractCondition {
/**
* Generated UID
*/
private static final long serialVersionUID = 4568269684824736461L;
private final Field lhs;
private final Field rhs;
private final Comparator comparator;
private transient QueryPartInternal mySQLCondition;
private transient QueryPartInternal sqliteCondition;
private transient QueryPartInternal compareCondition;
private transient QueryPartInternal caseExpression;
IsDistinctFrom(Field lhs, Field rhs, Comparator comparator) {
this.lhs = lhs;
this.rhs = rhs;
this.comparator = comparator;
}
@Override
public final void accept(Context ctx) {
ctx.visit(delegate(ctx.configuration()));
}
@Override
public final Clause[] clauses(Context ctx) {
return null;
}
/**
* Get a delegate CompareCondition, in case the context
* {@link SQLDialect} natively supports the IS DISTINCT FROM
* clause.
*/
private final QueryPartInternal delegate(Configuration configuration) {
// [#3511] These dialects need to emulate the IS DISTINCT FROM predicate, optimally using INTERSECT...
if (asList(CUBRID, DERBY).contains(configuration.family())) {
return (comparator == IS_DISTINCT_FROM)
? (QueryPartInternal) notExists(select(lhs).intersect(select(rhs)))
: (QueryPartInternal) exists(select(lhs).intersect(select(rhs)));
}
// ... or using a more verbose CASE expression
else if (asList().contains(configuration.family())) {
if (caseExpression == null) {
if (comparator == Comparator.IS_DISTINCT_FROM) {
caseExpression = (QueryPartInternal) decode()
.when(lhs.isNull().and(rhs.isNull()), zero())
.when(lhs.isNull().and(rhs.isNotNull()), one())
.when(lhs.isNotNull().and(rhs.isNull()), one())
.when(lhs.equal(rhs), zero())
.otherwise(one())
.equal(one());
}
else {
caseExpression = (QueryPartInternal) decode()
.when(lhs.isNull().and(rhs.isNull()), one())
.when(lhs.isNull().and(rhs.isNotNull()), zero())
.when(lhs.isNotNull().and(rhs.isNull()), zero())
.when(lhs.equal(rhs), one())
.otherwise(zero())
.equal(one());
}
}
return caseExpression;
}
// MySQL knows the <=> operator
else if (asList(MARIADB, MYSQL).contains(configuration.family())) {
if (mySQLCondition == null)
mySQLCondition = (QueryPartInternal) ((comparator == IS_DISTINCT_FROM)
? condition("{not}({0} <=> {1})", lhs, rhs)
: condition("{0} <=> {1}", lhs, rhs));
return mySQLCondition;
}
// SQLite knows the IS / IS NOT predicate
else if (SQLITE == configuration.family()) {
if (sqliteCondition == null)
sqliteCondition = (QueryPartInternal) ((comparator == IS_DISTINCT_FROM)
? condition("{0} {is not} {1}", lhs, rhs)
: condition("{0} {is} {1}", lhs, rhs));
return sqliteCondition;
}
// These dialects natively support the IS DISTINCT FROM predicate:
// H2, Postgres
else {
if (compareCondition == null)
compareCondition = new CompareCondition(lhs, rhs, comparator);
return compareCondition;
}
}
}
